Salt-free pickling two-step chrome tanning process
A salt-free pickling and chrome tanning technology, applied in small raw hide/large raw hide/leather/fur treatment, tanning treatment, small raw hide/large raw hide/leather hide/fur chemical treatment, etc. Secondary pollution and other problems, to avoid the use of neutral salt, fine grain, reduce the content of neutral salt
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Embodiment 1
[0014] A two-step chrome tanning process without salt pickling, comprising the following steps:
[0015] 1) After washing the softened limed leather, put it into the drum for the first step of tanning, add 100% water of the weight of the limed hide, and then add SF-1 with 2% weight of the limed hide Chrome powder tanning agent, at a temperature of 22°C, rotate for 2 hours;
[0016] 2) Add the diluted formic acid or sulfuric acid solution to the first step tanning bath solution in batches and adjust the pH of the bath solution to 2.2 within 30 minutes, and rotate for 2 hours at 22°C; then carry out the second step tanning and add liming 33% chrome powder with a tare weight of 4% alkalinity, at a temperature of 22°C, rotate for 2 hours; then use 2.2% sodium bicarbonate of liming tare weight to prepare an aqueous solution with a concentration of 10%, and add it in 6 times, with an interval of 20 minutes between each time. When the pH reaches 4.0, rotate for 1 hour, add 150% of t...
Embodiment 2
[0019] A two-step chrome tanning process without salt pickling, comprising the following steps:
[0020] 1) After washing the softened limed leather, put it into the drum for the first step of tanning, add water with 100% weight of the limed hide, make the grayed hide pigskin, and then add 2.5% SF- 1 chrome powder tanning agent, rotate for 3 hours at a temperature of 20°C;
[0021] 2) Add the diluted formic acid or sulfuric acid solution to the first step tanning bath solution in batches and adjust the pH of the bath solution to 3.0 within 30 minutes, and rotate for 1 hour at 20°C; then carry out the second step tanning and add liming 33% chrome powder with a tare weight of 3.5% alkalinity, at a temperature of 20°C, rotate for 2 hours; then use 1.8% baking soda with a liming tare weight to prepare an aqueous solution with a concentration of 10%, and add it in 6 times, with an interval of 20 minutes each time. Adjust the pH to 3.8, rotate for 1 hour, add 150% of the weight of ...
Embodiment 3
[0024] A two-step chrome tanning process without salt pickling, comprising the following steps:
[0025] 1) After the delimed and softened limed hide is washed with water, put it into the drum for the first step of tanning, add water with 100% weight of the limed hide, make the limed hide into sheepskin, and then add SF-1 with 3% weight of the limed hide Chrome powder tanning agent, at a temperature of 25°C, rotate for 4 hours;
[0026] 2) Add the diluted formic acid or sulfuric acid solution to the first step tanning bath solution in batches and adjust the pH of the bath solution to 3.0 within 30 minutes, and rotate for 2 hours at 25°C; then carry out the second step tanning and add liming 33% chrome powder with 3% alkalinity in tare weight, at a temperature of 25°C, rotate for 2 hours; then use baking soda with 2.2% liming tare weight to prepare an aqueous solution with a concentration of 10%, and add it in 6 times with an interval of 20 minutes each time. Adjust the pH to ...
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